柴北缘冷湖五号构造上干柴沟组储层特征研究  

Research of Structural Reservoir in No.5 Unit of Lenghu Area

作　　者：贾艳艳[1,2] 史基安[1] 申玉山[3] 周飞[3] 孙国强[1] 

机构地区：[1]中国科学院油气资源研究重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京石景山100049 [3]中国石油青海油田公司勘探开发研究院,甘肃敦煌736202

出　　处：《西南石油大学学报（自然科学版）》2013年第4期43-50,共8页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：中国科学院"油气资源研究"重点实验室开放基金(KFJJ2012-05)

摘　　要：通过岩石薄片、铸体薄片、扫描电镜及压汞等分析测试手段对储层特征进行了详细研究,发现柴北缘冷湖五号上干柴沟组储层主要为三角洲相细砂岩和粉砂岩,少部分中砂岩和粗砂岩。岩石主要经历了压实、胶结及溶蚀等成岩作用,具有压实、溶蚀作用中等和胶结作用较强的特点,胶结物主要有碳酸盐胶结、硫酸盐胶结、硅质胶结和自生黏土矿物胶结。储层现处于晚成岩阶段A期。研究区的孔隙类型主要是残余粒间孔和溶蚀扩大孔。储层物性受控于沉积相带和成岩作用,优质储层为三角洲分流河道砂、水下分流河道砂和席状砂,成岩作用对储层的影响主要体现在溶蚀作用对孔隙的扩大和压实、胶结作用对孔隙的破坏。Based on core observation, cast thin section, scanning electron microscopy and Hg-injection analysis and so on, we studied reservoir characteristics of structural reservoir in No.5 Unit of Lenghu Area in Qaidam Basin. The results show that the structural reservoir in No.5 Unit of Lenghu Area are mainly fine-grained sandstone and siltite, a small part of medium sandstone and coarse-grained sandstone of delta facies. The rocks were mainly experienced compaction, cementation and dissolution, and the diagenesis characteristics of the study area are medium compaction and dissolution, stronger cementation, the main cements are carbonate, sulfate, siliceous and clay mineral cement. Reservoirs are in A stage of late diagenesis. Pore types of the study area are residual intergranular pores and dissolution expand holes. Reservoir properties are both controlled by sedimentary facies and diagenesis, high quality reservoir is delta distributary channel sand, subaqueous distributary channel sand and sheet sand; Diagenesis also influences the reservoir properties in which compaction and cementation decrease the porosity, dissolution increases secondary porosity.

关 键 词：冷湖五号构造 上干柴沟组 成岩作用 储层特征 孔隙演化 

分 类 号：TE122[石油与天然气工程—油气勘探]